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JAMES EMERSON, OF LOWELL, MASSACHUSETTS.

Letters .Patent No. 79,562, dated July 7, 18.68.

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Y Be it known that I, JAMES EMERSOrg-ot' Lowell, county of Middlesex, and.State of Massachusetts, have invented a new and improved Device for Weighing Power; and I hereby declare the following to be afull, clear, and exact description of the same, reference being had to the annexed drawings, and to the letters of reference marked thereon.

Figure 1 is aperspective, the pulley C being longitudinally divided through its centre. The shaft E is i -also divided in the same way at that point.

Figure 2 is a side view of the pulley C, the fulcrum-bar D, and the levers K. I Figures 3, 4, 5, 6, and 7 are sections necessary to the'explanation.

The nature of my invention consists in applying the principle of the platform-scale -to the driving-pulley of a. shop or machine in such a way as to enable any one to weigh the power used thereby, the pulley being'the platform, thepower used, the load. A

The frames A A support the whole. The pulley B is rigidly secured to the shaft E.

The pulley C has a hole through its hub, considerably larger than the shaft E on whichit operates. It is entirely supported on the sharp points` of the screws P, which are made'of hardened steel, and rest exactly on the centre of the shaft, at the bottom ofthe holes c c, the said holes being larger than the screws P. I This arrangement is used to avoid frictiom- The screws are on a line longitudiuallybut transversely are placed` as shown in tig. I. The shaft E is made of hardened steel, to prevent wear, and while the points of the screws P are sharp, the pulley C oscillates very lightly` on the centre of the shaft E.

Another vplan to prevent frictionis shown i'n Figure 8, which represents pulley C, made with separate arms, each end of which is made knife-edged, resting in longitudinal V-shaped grooves in the shaft E and pieces T, the arms Y, pieces T, end shaf't E all being 'made of hardened steel.

The fulcrum-bar D, rigidly secured to theshaft E, is a thin,`ilat bar of iron, extending n early across the pulley C, with the hu'b H onits right and the-projections R R on its left side. From these projections extend the knife-edged studs 1hr, for the levers K to 'rest upon. These levers are connected to the ri'm of thefpulley C by the hangcrsfe e, the other end of the levers resting againstthe longitudinal arin 'of the elbows J'. These elbows are secured to the hub H by the screws d, the body of these screws. being knife-edged, as shown. in iig. 6. The transversearmof the elbows J is` connected by knife-edged bolts to the prongs b b of the connectinglink I, as shown in' the figs. l and 2. The said .link has a hole through its neck larger than the'shaft E, as represented in iig. 3, and is so made that it may not touch the shaft at all, being supported and kept parallel with the shaft by the pieces z', shown in iigs. 1, 5, and 7.

The rear end of the scale-beam vM is forked, as shown in iig. 4, which turns up at a right angle with the beam.. The fork is placed astride-of the neckl of the link I. The beam rests on knife-edges in the frame L, .as shown in g. 1. The beam is graduated, balanced, and used thc same as the beam ofthe common platformscale.

The gear F is secured to the frumeL by the screw O. It is rotated bythc screw S, one tooth at each revoilution ofthe shaft E. Its use is to indicate the number of revolutions the shaft E makes in a given time.

The spring t, 'g. 2, is secured to the ulcrum-bar D. Its outer end projects into the rim of the pulley C,

and is so adjusted that it. forces the periphery of the pulley in a direction contrary to that which it moves, by

depressing the outer end of the beam M. The object of the spring is to balance the beam, which is done by making rthe weight N equal the strength of the spring when the weight G is at zero.

Operation.

vPlace a belt from the motor around the pulley B, which will drive the whole in one direction, the top of the pulleys from the observer. Place a belt on the pulley C, to drive any machinery desired, the resistance from which -will react against the pulleyC, forcing its rim against the levers K, and through them to the scale-beam M, where the resistance may be balanced by the weight G,'as is done on platform-scales. If the weight G is nsuiicient, more may be added on the rod N. If the power used is uneven, the weight N may be immersed in water to steady it.

To find the power used,v multiply the weight shown on the beam b C per minute,'and divide by thirty-three thousand.

What I claim as'new, and desire to secure by Letters Patent, is

1. Connecting the rim of the driving-pulley C, placed loosely upon the shaft E, to the weighing-scale, in the manner and for the purpose as set forth.

2. Supporting the drivingpulley C upon the shaft by means of the sgrews dd, as and for the purpose set forth.

3. The connecting-links I, supported upon the knife-edges zz', as and for the purpose as setv forth.

4. The spring tconnecting the fulcrum-bar with the driving-pulley, when used as and for the purpose described.

5. In combination with thev` drivingating as and for the purpose described.

y the speed of the periphery of the pulley pulley C, fulcrum-bar D and weighing-scale, when connected and oper- JAMES EMERSON.

Witnesses:

ADDISON S. N UTE, EDWARD E. DIXON. 

